R/leafarea.R

In trobinj/trtools: Miscellaneous Tools for Teaching Statistics

#' Survey of leaf surface area.
#'
#' A simple random sample of 20 leaves from a population of 744 leaves of "shining gum" (\emph{Eucalyptus nitens}). The area of all 744 leaves was approximated by computing length times width, with a total area of 57266.6 cubic cm. The leaf surface area was accurately measured for only this sample of 20 leaves. 
#'
#' @format A data frame with 20 observations and two variables:
#' \describe{
#'    \item{area:}{leaf surface area (cubic cm)}
#'    \item{lengthwidth:}{leaf length times width (cubic cm)}
#' }
#'
#' @note The data are from Gregoire and Valentine (2007).
#'
#' @source Gregoire, T. G. & Valentine, H. T. (2007). \emph{Sampling strategies for natural resources and the environment}. Boca Raton, FL: Chapman & Hall/CRC.
"leafarea"